BIND 10 #2835: add interface to get properties of datasrc clients from ClientList

[BIND 10 Development]

#2835: add interface to get properties of datasrc clients from ClientList
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  medium        |                    Milestone:  Next-
           Component:  data source   |  Sprint-Proposed
            Keywords:                |                   Resolution:
           Sensitive:  0             |                 CVSS Scoring:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |  shared memory data source
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by jinmei):

 Replying to [comment:1 vorner]:
 > I'm not sure about the name. It is possible to have multiple 'sqlite3'
 clients in the same list, for example.

 Right, so the default (using the data source type) may not always
 work.  `ClientList` will check the uniqueness when it validates the
 given configuration.

 So, if we have this config:
 {{{
 "IN": [{
     "type": "sqlite3",
     "params": {"database_file": "/usr/local/var/bind10/zone.sqlite3"}
 }],
 "CH": [{
     "type": "sqlite3",
     "params": {"database_file": "/usr/local/var/bind10/zone.sqlite3"}
 }],
 }}}

 The default "sqlite3" name will be assumed for both clients, and this
 configuration will be rejected.  The administrator needs to give a
 unique name explicitly:
 {{{
 "IN": [{
     "type": "sqlite3",
     "name": "sqlite3-in",
     "params": {"database_file": "/usr/local/var/bind10/zone.sqlite3"}
 }],
 "CH": [{
     "type": "sqlite3",
     "name": "sqlite3-ch",
     "params": {"database_file": "/usr/local/var/bind10/zone.sqlite3"}
 }],
 }}}
 (in this case, one of the "name" param can be omitted)

-- 
Ticket URL: <http://bind10.isc.org/ticket/2835#comment:2>
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